Topeak DeFender M1 and XC11 Bike Fender Set fits MTB 29-Inch Tires Compact MTB fenders with quick release system install and remove in seconds XC11 Rear adjusts to allow multiple angle adjustments to maximize coverage XC11 Rear QR Clamp adjusts to fit 25.4-34.9mm posts M1 Front-fender quick release system allows for seamless integration with most forks QR fork attachment fits 19.6-26mm & 27.7-35mm steerer tube